Depending on where the leak is, if there is a weakness in the 350 it was with the oil cooler lines. It turns out that most of the oil leaks from the cooler lines has nothing to do with seals. It's a problem with the cooler line.
Yes, That would be the easiest thing 2 do.
how do you change a rear main seal in a Chevy 350 motor
Which belt? What year 350?
with a cooler 7 quarts with out the cooler it is 6 quarts
pan gasket, cooler lines, vent, front and rear seal.
Purchase an aftermarket cooler and follow the instructions included with the kit.
Yes, you sure can.
yes
Go for it
It don't have to have it. But it will make the engine LAST LONGER.
The lip on the seal always goes towards the pressure are the fluid.
1st. thing to do is replace the thermostat.